在MySQL中用空格连接两个字符串?
为此,您可以使用concat()
MySQL中的函数。让我们首先创建一个表-
mysql> create table DemoTable-> (
-> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> Name varchar(20),
-> Subject varchar(100)
-> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable(Name,Subject) values('John','MySQL');mysql> insert into DemoTable(Name,Subject) values('Chris','SQL Server');
mysql> insert into DemoTable(Name,Subject) values('Robert','MongoDB');
使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
输出结果
+----+--------+------------+| Id | Name | Subject |
+----+--------+------------+
| 1 | John | MySQL |
| 2 | Chris | SQL Server |
| 3 | Robert | MongoDB |
+----+--------+------------+
3 rows in set (0.00 sec)
这是用空格连接两个字符串的查询-
mysql> update DemoTable-> set Subject=concat(Name,' ',Subject);
Rows matched: 3 Changed: 3 Warnings: 0
让我们检查表中的所有记录-
mysql> select *from DemoTable;
输出结果
+----+--------+------------------+| Id | Name | Subject |
+----+--------+------------------+
| 1 | John | John MySQL |
| 2 | Chris | Chris SQL Server |
| 3 | Robert | Robert MongoDB |
+----+--------+------------------+
3 rows in set (0.00 sec)
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